package org.sy.lab.Java7并发编程实战.四线程执行器.七在执行器中周期性执行任务;

import java.util.Date;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;

public class Main {
	public static void main(String[] args) {
		ScheduledExecutorService executor = Executors.newScheduledThreadPool(1);
		System.out.printf("Main: Starting at: %s\n", new Date());
		Task task = new Task("Task");
		ScheduledFuture<?> result = executor.scheduleAtFixedRate(task, 1, 2, TimeUnit.SECONDS);
		for(int i=0; i<20; i++) {
			System.out.printf("Main: Delay: %d\n", result.getDelay(TimeUnit.MILLISECONDS));
			try {
				TimeUnit.MILLISECONDS.sleep(500);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
		executor.shutdown();
		try {
			TimeUnit.SECONDS.sleep(5);
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
		System.out.printf("Main: Finished at: %s\n", new Date());
	}
}
